Our periodicvideos chemistry channel has now uploaded 500 videos.
To mark this milestone (in base 10, at least) we've posted a few videos.
The main one is this music montage of highlights from the last five-and-a-half years.
Thanks to Alan Stewart for the great track, written specially for the occasion.
We also posted two Q&A videos, with Professor Martyn Polikaoff answer questions from our viewers (posted via Twitter and Facebook).
Here's the first:
And the second:
Periodicvideos stars various chemists from the School of Chemistry and the University of Nottingham.